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Period prevalence of disease excludes Mycobacterium gordonae (a rarely pathogenic species) and is calculated as the total number of persons whose illness fulfilled disease criteria ([greater than or equal to] 2 sputum nontuberculous Mycobacterium isolates or 1 bronchoscopic or biopsy nontuberculous Mycobacterium isolate) during 1 of the 5-year periods of interest (1998-2002 and 2006-2010), divided by the Ontario population at the midpoints of the periods (2000 for 1998-2002 and 2008 for 2006-2010).
Crude HIV period prevalence was calculated from ward records as total HIV-infected admissions/total admissions.
Period prevalence estimates of blood doping for the various subpopulations of samples are shown in Table 2.